What Attackers Can Do With 12,862 Leaked outlook.es Passwords

What Attackers Can Do With 12,862 Leaked outlook.es Passwords

On 21 June 2026, HEROIC analysts identified a stealer log uploaded to a Telegram channel containing 12,862 records tied to outlook.es, Microsoft's Spanish-language webmail service. Each record includes an email address, a plaintext password, and the login URL where it was entered, harvested directly from infected devices rather than from any breach at Microsoft.

What an Attacker Can Actually Do With These Credentials

With 12,862 plaintext email and password pairs, an attacker can log directly into each outlook.es inbox, read private messages, and use the account's password reset function to hijack other services tied to that email address. Because the passwords require no cracking, this can happen within minutes of the log changing hands.

What Was Exposed

• Email addresses
• Plaintext passwords
• Login URLs tied to each outlook.es account

Why Access to One Account Often Leads to Several

Once inside an inbox, an attacker can run credential stuffing against banking, shopping, and social media accounts using the same password, and use the compromised email to approve password resets elsewhere. That combination can lead to account takeover, identity theft, and financial fraud well beyond the original outlook.es login.

How Attackers Obtain Logs Like This in the First Place

Infostealer malware infects a device, often through pirated software or a malicious download, then silently copies every saved password, cookie, and autofill entry from the browser. The stolen data is compiled into a log and distributed on Telegram, where other criminals can purchase or download it and put it to use.

Check If You Are Affected

Do not give an attacker the chance to use your outlook.es credentials against you. HEROIC's free breach scanner checks your email against more than 400 billion breached and leaked records, including stealer logs like this one, so you can act before your data is misused.